There's a background graphics editor that runs on an NES or in an NES emulator. It comes with a command-line tool written in Python that turns a 256x240 pixel PNG image and a 32-character palette string into a save file for the background or vice versa. Converting a PNG to a save file and back is a good way to see whether a particular PNG file respects the NES limits.

What operating system does your PC run? FreeBSD, GNU/Linux, Windows, or something else?

There's a background graphics editor that runs on an NES or in an NES emulator. It comes with a command-line tool written in Python that turns a 256x240 pixel PNG image and a 32-character palette string into a save file for the background or vice versa. Converting a PNG to a save file and back is a good way to see whether a particular PNG file respects the NES limits.

What operating system does your PC run? FreeBSD, GNU/Linux, Windows, or something else?

You can easily make palettes for Photoshop or Gimp containing only the NES' colors, if that's the only restriction you're worried about. However, the NES doesn't work with RGB, the PPU creates its colors by directly manipulating the composite video signal... Add that to the fact that every TV displays colors differently and the result is that everyone remembers NES games differently, and there's no definitive 100% correct NES palette for use in computer programs. There are a few palette generators (such as this one) that allow you to tweak several parameters that affect how the the native NTSC signal is converted to RGB, so you can try creating one that you think looks correct and will work well for your game.

Do you know, or are you willing to learn, how to use the Windows Command Prompt? Or do you require that all applications have a GUI and be launchable through a double-click in File Explorer?

No. I'm working with linux in previous, but in this case i want draw my sprites in GUI environment.I'm ask about programs to draw sprites per pixel in style like nes. Not PS for DOS or something like this. Don't offtopic.I mean something like marmoset hexels

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